189,527 research outputs found
Lujan-Covey_SourceData.xlsx
No full textData that supports the findings of Lujan, Covey et al., Nat Comms paper on the mobilization of endogenous cannabinoids by midbrain neurons in mice. </p
A letter from Manuel Lujan to Dr. Hector P. Garcia.
No full textA letter from Manuel Lujan, Representative from New Mexico, to Dr. Hector P. Garcia regarding the future of the Naval band at NAS Corpus Christi
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A letter from Manuel Lujan to Dr. Hector P. Garcia.
No full textA letter from Manuel Lujan, Representative from New Mexico, to Dr. Hector P. Garcia regarding the future of the Naval band at NAS Corpus Christi
Hypostomus rhantos Armbruster & Tansey & Lujan 2007, New Species
No full text<i>Hypostomus rhantos</i> New Species <p>Figs. 1–2 and 3 b</p> <p> <b>Holotype:</b> MCNG 55352, 157.2 mm SL, Venezuela, Amazonas, Río Manapiare-Río Ventuari-Río Orinoco Drainage, Río Parucito at Raudales Salomon, 2.7 km NE of San Juan de Manapiare, 0 5.34637°, -066.03347°, D.C. Werneke, N.K. Lujan, O. León, 16 April 2004.</p> <p> <b>Paratypes:</b> 63 specimens. All collections Venezuela, Amazonas, Río Orinoco drainage: ANSP 160774, 11, 76.7–103.5 mm SL, Morichal 26.9 km from Puerto Ayacucho, along Puerto Ayacucho – Caicara highway, B. Chernoff et al., 15 November 1985; ANSP 162365, 2, 134.4–139.0, Backwater of Río Orinoco behind sand playa ca. half hour upstream from Isla Temblador, 03°04’N, 066°28’W, B. Chernoff, et al., 10 March 1987; ANSP 185240, 4, 56.8–124.5, AUM 39273, 3 c &s, 5, 53.5–149.7, MCNG 55353, 5, 52.0–154.5, UF 164255, 2, 54.4–145.5, Same data as holotype; AUM 39308, 1, 124.0, MCNG 55354, 2, 94.7–99.2, RMNH 35500, 1, 99.0, Río Manapiare, tributary of Río Ventuari, 14.5 km NW of San Juan de Manapiare, 0 5.42863°, -066.13616°, N.K. Lujan, M.H. Sabaj, L.S. de Souza, and D.C. Werneke, 12 April 2004; AUM 39235, 1, 52.9, Río Ventuari, beach across the river from Picua Village, 34 km ENE of Macuruco, 104 km E of San Fernando de Atabapo, 0 4. 11534°, -066.76457°, M.H. Sabaj, N.K. Lujan, D.C. Werneke, L.S. de Souza, and O. León, 5 April 2004; AUM 39874, 1, 145.3, Río Ventuari at mouth of Caño Camoni, 145 km NNE of Macuruco, 189 km NE of San Fernando de Atabapo, 0 5.05588°, -066.32742°, M.H. Sabaj, N.K. Lujan, D.C. Werneke, L.S. de Souza, and O. León, 8 April 2004; AUM 40070, 1, 123.4, Río Manapiare, tributary of Río Ventuari, 20 km NW of San Juan de Manapiare, 0 5.45272°, -066.17682, D.C. Werneke, N.K. Lujan, and L.S. de Souza, 12 April 2004; AUM 39506, 1, 168.7, Río Ventuari at Raudales Tencua, 56 km ESE of San Juan de Manapiare, 0 5.04968°, -065.62722, D.C. Werneke, N.K. Lujan, O. León, A. Luna, and R. Pajua, 20–21 April 2004; AUM 39216, 1, 93.1, Río Ventuari, mouth, 3.99528°, -067.04250°, N.K. Lujan and O. León, 15 April 2004; AUM 41496, 1, 147.5, Río Manapiare at mouth of Caño Yutaje, tributary of Río Ventuari, 14 km NW of San Juan de Manapiare, 0 5.43667°, -066.11261°, M.H. Sabaj, L.S. de Souza, D.C. Werneke, and N.K. Lujan, 11 April 2004; AUM 41418, 1, 164.4, MCNG 55355, 1, 154.5, Río Ventuari, bedrock outcrops, 83 km ENE of Macuruco, 153 km ENE of San Fernando de Atabapo, 0 4.25346°, -066.34466°, N.K. Lujan, D.C. Werneke, M.H. Sabaj, L.S. de Souza, and O. León, 6 April 2004; AUM 41336, 1, 70.2, Caño Guavialito, tributary of Río Manapiare, tributary of Río Ventuari, near Alto Guaviarito, 17.5 km NW of San Juan de Manapiare, 0 5.44135°, -066.16294°, L.S. de Souza, D.C. Werneke, N.K. Lujan, and M.H Sabaj, 13 April 2004; AUM 41440, 1, 66.3, ANSP 185241, 1, 66.9, Caño Guavialito, tributary of Río Manapiare, tributary of Río Ventuari, directly off of Río Manapiare, 17.5 km NW of San Juan de Manapiare, 0 5.44010°, -066.16175°, M.H. Sabaj, L.S. de Souza, D.C. Werneke, and N.K. Lujan, 13 April 2004; AUM 41496, 1, 147.5, Río Manapiare, tributary of Río Ventuari, at mouth of Cano Yutaje, 14 km NW of San Juan de Manapiare, 05.43667°, -066.11261°, M.H. Sabaj, L.S. de Souza, D.C. Werneke, and N.K. Lujan, 11 April 2004; AUM 42100, 8, 50.6–176.4, Río Orinoco, beach and bedrock outcropping, 50 km E of San Fernando de Atabapo, 03.97029°, -067.25506°, N.K. Lujan, D.C. Werneke, M.H. Sabaj, M. Arce, R. Betancur, and T.E. Wesley, 2 March 2005; AUM 42114, 5, 135.6–159.1, Río Orinoco, 117 km W of La Esmeralda, N.K. Lujan, M. Arce, T.E. Wesley, et al., 03.28998°, -066.60004°, 29 March 2005; AUM 42121, 3, 115.0–126.0, Río Orinoco, 33.9 km E of La Esmeralda, Punto Piaroa, 03.14744°, -065.85381°, N.K. Lujan, M. Arce, T.E. Wesley, et al., 28 March 2005; AUM 42164, 1, 195.8, Río Orinoco, bedrock outcrop, 52.9 km SE of San Antonio, 102 km W of La Esmeralda, 03.10036°, -066.46277°, N.K. Lujan, D.C. Werneke, M.H. Sabaj, O. León, M. Arce, R. Betancur, and T.E. Wesley, 4 March 2005; AUM 42220, 1, 136.7, Río Orinoco, near Puerto Ayacucho on a beach called Playa Bagre, 05.65642°, -067.63103, N.K. Lujan, M. Arce, and T.E. Wesley, 13 April 2005.</p> <p> <b>Diagnosis:</b> <i>Hypostomus rhantos</i> is unique among <i>Hypostomus</i> (except for <i>H. micromaculatus</i>) by having extremely small spots (see especially Fig. 2). <i>Hypostomus rhantos</i> is a member of the <i>H. plecostomus</i> group, but is not a member of the <i>H. cochliodon</i> subgroup (Armbruster, 2004). <i>Hypostomus rhantos</i> can be separated from the <i>H, emarginatus</i> species group by having a dark brown base color (vs. light tan), by having a small buccal papilla (vs. large), and by lacking hypertrophied odontodes on the lateral plates of nuptial males (vs. hypertrophied odontodes present); and from the <i>H. cochliodon</i> species subgroup of the <i>H. plecostomus</i> group by having viliform teeth (vs. spoon-shaped). <i>Hypostomus rhantos</i> can be separated from all other members of the <i>H. plecostomus</i> group (including species of the <i>H. cochliodon</i> subgroup) except <i>H. micromaculatus</i> by having extremely small spots (greater than 15 on the first plate in the dorsal series in <i>H. rhantos</i> vs. five or fewer). <i>Hypostomus rhantos</i> can be separated from <i>H. micromaculatus</i> by having all of the spots round and evenly distributed (vs. spots longitudinally oval and restricted to rows Figs. 1–2 vs. Fig. 4), keels of lateral plates well-developed (vs. weak), a ridge present on the pterotic that is contiguous with the supraorbital ridge (vs. ridge absent, Fig. 3), and by having a fully plated abdomen (vs. abdomen partially plated or naked). In addition, smaller specimens of <i>H. rhantos</i> have spots on the dorsal fin whereas small specimens of <i>H. micromaculatus</i> have the dorsal fin entirely dark.</p> <p> <b>Description:</b> Morphometric data given in Table 1. Largest specimen 195.8 mm SL. Head and nape forming arch from tip of snout to origin of dorsal fin. Body depth decreasing from origin of dorsal fin to dorsal procurrent caudal spines then increasing to caudal fin. A rounded ridge present from anterodorsal corner of orbit, running ventral to nares, and ending slightly anteroventral of anterior nare. Longitudinal ridge of raised bone and slightly larger odontodes present on pterotic-supracleithrum beginning at posterodorsal corner of orbit and contiguous with supraorbital ridge. Space between orbits concave such that supraorbital ridge higher than medial surface of head. Supraoccipital convex medially with slight crest.</p> <p>Nares separated by flap of skin held erect in life. Dorsal, middorsal, median and midventral plate rows complete from head to caudal fin, ventral plate row begins at insertion of pelvic fin and continues to caudal fin. Lateral plates with short, median keels with enlarged, dull odontodes. Keels on first two plates of dorsal row and sometimes first three plates forming line from supraoccipital to posterolateral corner of nuchal plate, not confluent with keel on dorsal plate row beginning on fourth plate. Base of caudal fin covered in elongate, roughly triangular plates. Entire ventral surface of head and body (except region around insertion of pelvic fin) covered in small platelets. Platelets on abdomen increase in number with standard length. Head covered in small plates. Frontal, nasal, sphenotic, infraorbitals, opercle, pterotic-supracleithrum, suprapreopercle, and supraoccipital supporting odontodes. Platelets that cover anteroventral corner of opercle slightly separated from opercle allowing plates to be marginally everted (angle of eversion less than 30º).</p> <p> Dorsal fin moderately long, usually just barely reaching preadipose plate when depressed, consisting of small, <i>V</i> -shaped spinelet, fairly strong spine, and seven rays. Caudal fin forked, lower lobe longer than upper. Pectoral-fin spine strong, extending posteriorly to pelvic-fin rays when depressed ventral to pelvic fin; cleithrum with exposed process dorsal to pectoral-fin rays that tapers posteriorly to point; pectoral fin inserted on same plane as pelvic fin such that spine, when depressed parallel with body, lies on top of and in contact with pelvic fin. Pelvic-fin spine thin, flexible, reaches slightly beyond base of anal fin. Anal fin with relatively strong, unbranched first ray supporting odontodes. Adipose fin consisting of single median, unpaired preadipose plate and a stout, strong, pointed spine; adipose-fin membrane not reaching procurrent caudal-fin spines. Dorsal fin II,7, pectoral fin I,6, pelvic fin I,5, anal fin I,4, caudal fin I,14,I. Jaws weakly angled, dentaries forming angle much greater than 90º. Teeth numerous (28–45, mode 31 in premaxilla, 29–45, mode 31, in dentary, N = 48), bicuspid, median cusp moderately long, lateral cusp about one fourth length of median, stalk moderately long. Median plates 24.</p> <p> <b>Coloration:</b> Light gray to tan when alive, becoming tan when preserved. Body densely covered with tiny spots, head spots even smaller than body spots. Spots present on all fins, generally larger than spots on body, evenly distributed on rays, spines, and membranes. Caudal fin membranes light and spotted anteriorly, fading to dark wash posteriorly. Abdomen lighter than sides, with tiny spots. Occasionally with four dorsal saddles, first below anterior dorsal-fin rays, second below and slightly behind posterior dorsal-fin rays, third below and slightly anterior to adipose-fin spine, and fourth at base of caudal peduncle; all saddles angled anteriorly, saddles one and two combine and continue to base of pelvic fin, third and fourth terminating at middle of midventral plate row. Fin spines usually lighter than rest of body. Spots relatively larger in juveniles. Juveniles with fewer spots distally on all fins, lower half of caudal fin much darker.</p> <p> <b>Range:</b> Currently known from the Río Ventuari, a tributary of the upper Río Orinoco, and the mainstem upper Orinoco above Puerto Ayacucho to the Río Casiquiare in Amazonas, Venezuela (Fig. 5).</p> <p> <b>Ecology:</b> <i>Hypostomus rhantos</i> was collected in loricariid assemblages with an average of 7.2 loricariid species per site (n=16 sites). Habitats from which <i>H. rhantos</i> were collected range from consolidated lateritic rocks in flow, to bedrock cracks in flow, to branches and trunks of trees in slack water.</p> <p> <b>Etymology:</b> <i>Rhantos</i> is Greek for sprinkled, speckled, or spotted and refers to the tiny randomly placed spots of the species.</p> <p> <b>Discussion:</b> Specimens of <i>Hypostomus rhantos</i> were analyzed in Armbruster (2004a) but were incorrectly referred to as <i>H. micromaculatus</i>. <i>Hypostomus rhantos</i> was found to be the sister to <i>H. robinii</i>; however, support for this was very weak (Bremer decay index = 1), and derived from only from two homoplastic characteristics: posteromedial invagination of the fifth ceratobranchial present (character 11 state 1 from Armbruster, 2004) and a reversal to a short levator arcus palatini crest (44-1). This clade was part of a larger clade consisting of the <i>H. cochliodon</i> subgroup, <i>Hypostomus plecostomus</i>, the potentially undescribed <i>Hypostomus</i> similar to <i>H. robinii</i> from the Orinoco, and <i>H. cordovae</i>, with this clade being supported by a reversal to a wide posterior edge to the posterior process of the coracoid (158-0). This clade is also poorly supported with a Bremer decay index of one. Most of the relationships within <i>Hypostomus</i> are poorly resolved and need much further study.</p> <p> <i>Hypostomus rhantos</i> is most similar in coloration to <i>H. micromaculatus</i> from Suriname. In addition to coloration, <i>H. rhantos</i> appears taller and wider than <i>H. micromaculatus</i>; however, we do not have enough specimens available to provide confident measurements of this. There are no species that have been described or that we have examined between the Upper Orinoco and Suriname with a similar color pattern. Given the vast distance between the two species, it would be unlikely that they would be sister species. They are different in the size of the keels (relatively well-developed in <i>H. rhantos</i> and almost absent in <i>H. micromaculatus</i>) and the amount of abdominal plating (fully plated in <i>H. rhantos</i> and absent or nearly so in <i>H. micromaculatus</i>). Although these characteristics change a lot in loricariids, they do suggest when coupled with locality data that the two species may have small spots via convergence.</p> <p> <b> Paratypes of <i>Hypostomus micromaculatus</i> examined:</b> RMNH 25482, 1; RMNH 25484, 2; 25487, 3.</p>Published as part of <i>Armbruster, Jonathan W., Tansey, Leigh A. & Lujan, Nathan K., 2007, Hypostomus rhantos (Siluriformes: Loricariidae), a new species from southern Venezuela, pp. 59-68 in Zootaxa 1553</i> on pages 60-67, DOI: <a href="http://zenodo.org/record/178176">10.5281/zenodo.178176</a>
Pseudolithoxus kelsorum Lujan & Birindelli, 2011, new species
No full text<i>Pseudolithoxus kelsorum</i>, new species <p>Figure 1. Table 1.</p> <p> <b>Holotype.</b> MCNG 55357, 66.0 mm SL, Venezuela, Amazonas State, Orinoco River drainage, Orinoco River at Merey, 97.6 km N of San Fernando de Atabapo, 4°55'04''N, 67°49'58''W, J. Birindelli, N. K. Lujan & V. Meza, 18 April 2010.</p> <p> <b>Paratypes.</b> Five specimens, collected with holotype. ANSP 182813, 1: 36.6 mm SL, AUM 51644, 2: 40.0, 52.4 mm SL; MCNG 55358, 1: 44.0 mm SL; MZUSP 108090, 1: 52.7 mm SL.</p> <p> <b>Diagnosis.</b> <i>Pseudolithoxus kelsorum</i> is diagnosed from all other <i>Pseudolithoxus</i> by having dark brown to black base color with eight to 11 (usually nine) light yellowish vertical or oblique (tilted dorsoanteriorly) transversal bands between orbits and caudal fin, bands wide and rarely but sometimes incomplete or contorted as swirls (Fig. 1; vs. dark brown to black base color with 18 or more thin, light yellow, frequently contorted transversal bands between orbits and caudal fin in <i>P. tigris</i>, Fig. 2; black base color with small white spots in <i>P. anthrax</i> and <i>P. n i c o i</i>; and light brown base color with dark brown to black spots in <i>P. dumus</i>, Fig. 3).</p> <p> <b>Description.</b> Morphometrics in Table 1. Largest specimen 66.0 mm SL. Head and body dorsoventrally flattened with body depth greatest at supraoccipital; dorsal and ventral profiles only slightly convergent caudally. Snout surface and body flanks armored with ossified dermal plates, each covered with small odontodes; plates absent from small region at posteroventral corner of pterotic and entire abdomen. Cheek plates bearing moderately to highly hypertrophied, distally-hooked odontodes (mean 35, range 27–42, holotype 42) evertible to approximately 90º from sagittal plane; longest odontodes extending to posterior exposed margin of opercle. Orbit positioned dorsally on head with opening sloped ventrolaterally at approximately 45º from sagittal plane in anterior view.</p> <p>Oral disk occupying most of ventral surface of head anterior of cleithrum. Interpremaxillary and intermandiblar tooth row angle greater than 110º; premaxillary teeth 55–64 (average 61, holotype = 64); dentary teeth 47–57 (average 53, holotype 54). All teeth with gracile, flexible shafts and bicuspid heads bent inward at right angle to shaft. Maxillary barbel short and attached to lower lip along most of length; ventral surface of labial disk with hemispherical papillae decreasing in size distally and toward rictus; posterior margin of labial disk lacking fimbriae.</p> <p>ILM Measurement Holotype Mean SD Min Max 1–20 Standard length 66.0 48.6 10.7 36.6 66.0 Percents of standard length</p> <p>17–19 Adipose—upper caudal distance 14.2 14.1 1.2 11.9 15.3 15–19 Caudal peduncle depth 7.6 7.3 0.9 5.9 8.2 15–17 Adipose—lower caudal distance 19.3 19.2 1.2 17.4 20.8 14–17 Adipose—anal distance 19.3 19.0 1.3 17.0 20.3 Dorsal fin II,7; dorsal-fin spinelet small but visible, V-shaped; dorsal-fin lock functional; posteriormost dorsalfin ray free from body. Pectoral fin I,6; adpressed pectoral-fin spine reaching approximately halfway between anus and pelvic-fin origin; anterodorsal surfaces of spine with many hypertrophied odontodes increasing in length distally; odontodes longer an more numerous in larger specimens. Pelvic fin I,5; pelvic-fin spine extending to or past insertion of anal fin when adpressed. Anal fin I,4; second unbranched ray longest. Adipose-fin spine straight; adnate to caudal peduncle via fleshy membrane with concave or convex posterior margin. Caudal fin I,14,I; dorsal procurrent caudal-fin rays four; ventral procurrent caudal-fin rays four; caudal fin obliquely and asymmetrically emarginated, with ventral lobe longer than dorsal lobe.</p> <p>Body broadest at cleithrum; posterior margin of exposed posterior process of cleithrum squared or tapering to a point. Lateral median plates 23–25 (mode 23, holotype 24), middorsal plates 20–23 (mode 23, holotype 20), midventral plates 22–25 (mode 23, holotype 23); anteriormost midventral plate strongly bent. Caudal peduncle plate rows three. One or two azygous preadipose plates (mode one, holotype one); predorsal plate rows two not including nuchal plate; interdorsal plate rows four or five (mode five, holotype four).</p> <p> <b>Color.</b> Body with dark brown to black base color with eight to 11 (usually nine) light yellow vertical or oblique (tilted dorsoanteriorly) transversal bands between orbits and caudal fin; bands wide and rarely but sometimes incomplete or contorted as swirls (Fig. 1). Paired, dorsal, adipose, and caudal fins light with dark bands. Snout with light yellow longitudinal bands, small spots, or contortions. Abdomen pale; lower lip, ventral plated surfaces, ventral paired-fin spine surfaces, and anal fin uniformly light yellow to tan.</p> <p> <b>Distribution and habitat.</b> Known only from a single site on the Orinoco River just above the Maipures rapids and approximately 60 km south of the Atures rapids (Fig. 4). Type material collected via rotenone and castnet from a single shoreline granite outcrop. Anecdotal reports (O. Lucanus pers comm. to NKL) suggest that the range of <i>Pseudolithoxus kelsorum</i> extends downstream into the Atures rapids. However, extensive ichthyological surveys of the Orinoco River further upstream by the first author and colleagues have failed to yield specimens of <i>P. k e l s o r u m</i>, suggesting that its distribution is limited to only more downstream reaches, possibly including the nearby and still poorly surveyed lower reaches of western tributaries of the Orinoco in Colombia.</p> <p> <b>Etymology.</b> Named in honor of George and Carolyn Kelso whose generous contribution to Texas A&M University and to the Winemiller Aquatic Ecology Lab has facilitated important ichthyological discoveries, including this new species.</p>Published as part of <i>Lujan, Nathan K. & Birindelli, Jose L. O., 2011, A new distinctively banded species of Pseudolithoxus (Siluriformes: Loricariidae) from the upper Orinoco River, pp. 38-46 in Zootaxa 2941</i> on pages 39-43, DOI: <a href="http://zenodo.org/record/278154">10.5281/zenodo.278154</a>
Characidium wangyapoik Armbruster & Lujan & Bloom 2021, new species
No full text<i>Characidium wangyapoik</i>, new species <p>urn:lsid:zoobank.org:act: 1EBB34BE-431E-4D03-A343- 6E8132EE810C</p> <p>Figures 1A, 11–12</p> <p> <i>Characidium</i> n. sp. ‘Ireng’.— Lujan et al., 2020: 1216 [locality information].</p> <p> <i>Holotype.—</i> CSBD F-3615 (ex AUM 67118), 1 (1mo/me, 1gm), 72.6 mm SL, Guyana (border with Brazil), Potaro-Siparuni (Region 8), Amazon River basin, Ireng River, first shoal upriver from split with Sukwabi Creek, 5.07711, –59.97423, N. K. Lujan, J. W. Armbruster, D. C. Werneke, M. Ram, 8 January 2016.</p> <p> <i>Paratypes.—</i> All specimens Guyana (border with Brazil), Potaro-Siparuni (Region 8), Amazon River basin, Ireng River basin (known as the Rio Mau in Brazil): ANSP 207526, 3 (1mo/me, 3gm), 42.6–56.8 mm SL, AUM 67036, 26 (5mo/ me, 26gm, 4cs), 22.0– 59.9 mm SL, CSBD F-3616, 3 (1mo/me, 3gm), 37.7–52.2 mm SL, INPA ICT-059496, 3 (0mo/me, 3gm), 52.6–54.6 mm SL, ROM 111286, 3 (0mo/me, 3gm), 47.7–53.8 mm SL, Ireng River, at Orinduik Falls, between upper and lower falls, 4.72536, –60.03852, D. C. Werneke, J. W. Armbruster, N. K. Lujan, M. Ram, 2 January 2016; AUM 67046, 16 (0), 17.8–46.4 mm SL, Ireng River, below lower Orinduik Falls, 4.71898, –60.03507, N. K. Lujan, J. W. Armbruster, D. C. Werneke, M. Ram, 3 January 2016; AUM 67068, 18 (0), 25.2–43.5 mm SL, Ireng River, at Branana Rapids, shoals downstream of Orinduik Falls, 4.67585, –60.06046, D. C. Werneke, J. W. Armbruster, D. I. Brooks, M. Ram, 4 January 2016; AUM 67076, 4 (0), 36.0– 40.4 mm SL, Ireng River, at Orinduik Falls, between upper and lower falls, 4.72536, –60.03852, D. C. Werneke, J. W. Armbruster, D. I. Brooks, M. Ram, N. K. Lujan, 4 January 2016; AUM 67077, 20 (0mo/me, 13gm), 31.8–51.9 mm SL, Ireng River, at Orinduik Falls, around halfway between upper and lower falls, 4.72176, –60.03703, D. C. Werneke, J. W. Armbruster, D. I. Brooks, M. Ram, N. K. Lujan, 4 January 2016; AUM 67094, 1 (0), 30.2 mm SL, Ireng River, just above Orinduik Falls, 4.72798, –60.03597, N. K. Lujan, J. W. Armbruster, D. C. Werneke, D. I. Brooks, M. Ram, 5 January 2016; AUM 67118, 14 (4mo/me, 7gm, 2cs), 49.4–76.1 mm SL, INPA ICT-059497, 2 (1mo/me, 2gm), 60.6–62.6 mm SL, first shoal upriver from split with Sukwabi Creek, 5.07711, –59.97423, N. K. Lujan, J. W. Armbruster, D. C. Werneke, M. Ram, 8 January 2016; AUM 67143, 6 (0mo/me, 6gm), 44.8–67.7 mm SL, Ireng River, shoals at mouth of Monkey Creek, Kaibarupai, 5.04398, –59.97717, N. K. Lujan, J. W. Armbruster, D. C. Werneke, 9 January 2016; AUM 67181, 9 (3mo/me, 9gm), 49.1–68.8 mm SL, ROM 111287, 2 (2mo/me, 2gm), 60.6–61.3 mm SL, Ireng River, shoals at mouth of Monkey Creek, Kaibarupai, 5.04398, –59.97717, J. W. Armbruster, N. K. Lujan, D. I. Brooks, 12 January 2016; AUM 67189, 2 (0mo/ me, 2gm), Sukwabi Creek, East Fork, downstream of Wotowanda Falls, 5.08867, –59.96952, J. W. Armbruster, N. K. Lujan, D. I. Brooks, D. C. Werneke, P. Peters, R. Daniel, local fishermen, 13 January 2016; AUM 67196, 12 (0mo/me, 11gm), 28.1–67.9 mm SL, Ireng River, downstream of Kaibarupai, 5.02404, –59.97763, D. C. Werneke, J. W. Armbruster, N. K. Lujan, M. Ram, D. I. Brooks, 14 January 2016; AUM 67199, 2 (0), 19.7–23.2 mm SL, Ireng River, at Sand Hill shoals, 4.96554, –59.99411, D. C. Werneke, J. W. Armbruster, N. K. Lujan, M. Ram, D. I. Brooks, 14 January 2016; AUM 67204, 12 (5mo/me), 17.1–72.0 mm SL, Ireng River, at Waipa Landing, 4.93345, –59.99514, D. C. Werneke, J. W. Armbruster, N. K. Lujan, M. Ram, D. I. Brooks, 14 January 2016.</p> <p> <i> <i>Diagnosis.—</i> Characidium wangyapoik</i> can be distinguished from all crenuchids except <i>C. crandellii, C. declivirostre,</i> and <i>C. duplicatum</i> by having venter without scales from the isthmus to the pelvic girdle (vs. maximally to pectoral insertion) and from most species of <i>Characidium</i> by having a very large pectoral fin with first three unbranched pectoral-fin rays thickened and first pectoral-fin ray bent at an oblique angle (vs. pectoral-fin rays not thickened and first pectoral-fin ray either straight or slightly convex). <i>Characidium wangyapoik</i> differs from <i>C. crandellii, C. declivirostre,</i> and <i>C. duplicatum</i> by having at least the ventral region of flank with thin bars becoming contiguous across body at larger sizes (vs. ventral area with almost square blotches), having lateral-line canal in most of scales very short (<b>~</b> 25% of scale length), and having canal pores covered by preceding scales (vs. canal at least 33% of scale length and pores not covered by preceding scales); from <i>C. crandellii</i> by having 10 circumpeduncular scales (vs. 12), having two or more thin dark bands consisting of spots on rays in dorsal and pectoral fins (vs. a median wide dark band with pigment concentrated on membranes in dorsal fin and pectoral fin either entirely dark or dark with lighter middle), having an almost square dorsal fin with slightly concave distal margin (vs. falcate), having adipose fin located above middle of anal-fin base (vs. anterior edge of adipose fin at or behind vertical through posteriormost anal-fin insertion), by having dentary and premaxillary teeth narrow, peg-like, and maximally tricuspid with only central cusp well developed (vs. wide and tri- to pentacuspid, central cusp longest), by having zero to two (total) teeth in second dentary row (vs. 8 or more); by a preanal length/SL ratio of 77.4–82.3% (vs. 72.9–76.6%), and anal–apex length/SL ratio of 94.6–100.3% (vs. 89.4–94.0%); from <i>C. declivirostre</i> by having the flanks with 10 or more narrow bars (vs. less than 10 almost square blotches); and from <i>C. duplicatum</i> by having one leading unbranched pelvic ray (vs. two). <i>Characidium wangyapoik</i> is most similar in color to <i>C. amaila</i> from the upper Kuribrong River, but it has bands in the dorsal and pectoral fins (vs. no bands in <i>C. amaila</i>) and the unbranched pectoral-fin rays are greatly thickened (vs. only slightly thickened).</p> <p> <i>Description.—</i> Measurements based on 21 specimens (Table 2); meristics based on 20 specimens (reported below). Dorsal profile of body forms convex arc from tip of snout to posterior end of supraoccipital, then becomes steeper and longer convex arc from supraoccipital to end of dorsal fin (highest point of arc at dorsal-fin origin); dorsal profile relatively straight and ventrally angled from dorsal fin to adipose fin, then forming concave arc to caudal fin. Ventral profile straight to anal fin, then forming concave arc to caudal fin. Body depth greatest at dorsal origin and least at middle of caudal peduncle. Body oval in cross section anteriorly (flattened ventrally) and oval with dorsal and ventral surfaces somewhat flattened on caudal peduncle. Eye diameter 52.5–69.0% snout length, decreasing in size with SL (Fig. 3), oval, angled with anterior vertex ventral to posterior vertex; dorsal rim of orbit slightly higher than interorbital surface. Snout broadly rounded. Gill membranes united across isthmus. Tubercles present in both sexes dorsally on head and anterodorsal scales.</p> <p>Scales cycloid with most scales having 10–30 short, parallel striae (most on first postdorsal scale). Lateral line complete with canal occupying approximately 1/4 of scale length and pores covered by previous scales; 30 (1), 31 (4), 32 (12), or 33 (3) lateral-line scales; lateral-line scales distinctly smaller anteriorly; naked area between anterior lateral-line scales and pectoral-fin base; lateral line continues onto scales covering caudal base. 4 scales above lateral line and 2 scales below lateral line; 10 circumpeduncular scales. Scales covering anterior 1/5 of caudal fin. 7 (2), 8 (14), or 9 (4) predorsal scales. Venter unscaled on isthmus and posteriorly to 4 to 5 scales anterior to pelvic-fin origin.</p> <p> Dorsal fin with 2 unbranched and 8 (1) or 9 (19) branched rays (ii,8–9); first unbranched ray about 1/3 length of second; first unbranched ray longest and last shortest; fin roughly rectangular. Pectoral fin with 3 unbranched and 10 (19) or 11 (1) branched rays (iii,10–11); unbranched rays and first branched ray with thick pads of tissue anteriorly; first unbranched ray strongly curved; first branched ray longest and last shortest; pectoral fin oriented obliquely on body with posteriormost insertion located posterodorsally to origin. Pelvic fin with 1 leading unbranched ray, 6 (19) or 7 (1) branched rays, and 1 posterior unbranched ray (i,6–7,i); first branched ray longest; 2 to 3 pelvic axillary scales present with complex covering <b>~</b> half of pelvic-fin base. Anal fin with 2 unbranched rays and 5 branched rays (ii,5); first unbranched ray slightly less than 1/3 length of second, closely adhered; fin margin curved with second unbranched ray longest and last branched ray shortest. Caudal fin with 1 unbranched and 8 (4) or 9 (16) branched rays in upper lobe and 8 (16), or 9 (4) branched and 1 unbranched ray in lower lobe (i,8–9,8–9,i); forked with upper and lower lobes coequal. Adipose fin present with base centered on vertical through middle of anal-fin base. Rays of paired, dorsal, and anal fins with thick flaps of skin dorsally (paired fins) and laterally (dorsal and anal fins) that overlap successive rays in adpressed fins; flaps widest and longest anteriorly, decreasing in size and width posteriorly, flaps usually absent on posterior rays.</p> <p>Teeth tricuspid, narrow and peg-like with median cusp round and lateral cusps poorly developed. 6 (4), 7 (12), or 8 (4) premaxillary teeth. 9 (3), 10 (6), 11 (6), 12 (4), or 14 (1) teeth in outer dentary row. Inner dentary row comprising many small, unicuspid teeth; teeth may be poorly visible or absent in smaller specimens. Ectopterygoid with two rows of approximately 10 (lateral) and 5–10 (medial) minute teeth.</p> <p> Branchiostegal rays 4; 1 ray attached to posterior ceratohyal; 3 rays attached to anterior ceratohyal. Gill rakers 2–3 on dorsal limb, 1 on angle, 6–7 on ventral limb of anterior branchial arch. One supraorbital present; crescent shaped; from dorsal midpoint of orbit to dorsal <b>~</b> 1/4 of anterior scleral ossicle. All elements of infraorbital series, except infraorbital 1, without laminar component. Parietal branch of supraorbital sensory canal extending less than 1/4 into parietal. Parietal fontanel reduced to tiny triangle at posterior borders of parietals, almost absent in some; smallest specimens with gap between parietals. Frontal foramina above supraorbital canal 3–4 with some posterior foramina sometimes combined, wide, circular.</p> <p>Total number of vertebrae 33 (3). Vertebral centra 2–4 fused, without ventral processes. Rib of centrum 4 distally expanded, extending anteriorly toward lateral process of centrum 2. Posterior chamber of swim bladder extremely reduced, about length of one vertebral centrum. Supraneurals between neural spine of fourth centrum and anterior dorsal-fin pterygiophore 4 (4), 5 (1). Epurals 3 (5). Uroneural present, about 1/2 as long as urostyle.</p> <p> <i>Coloration in life.—</i> (Fig. 11) Base color tan with slight yellow tinge (particularly on head, fins, and dorsally). Dorsal surface with many (<b>~</b> 10) diffuse saddles that seem to subdivide in larger specimens. Faint stripe present along lateral line. Numerous narrow bars below lateral line (1–1.5 scale rows wide). These may extend above lateral line and join with dorsal saddles (particularly in larger specimens). Color generally concentrated on scales with each scale having lighter edges, but either anterior or posterior edges may be light. Ventral surface gray with ventral bars almost meeting midventrally. Iridescent yellow-green stripe noticeable in some specimens between midlateral stripe and dorsal surface; stripe located below dark pigment and fades at insertion of posteriormost dorsal-fin ray.</p> <p>Head with dorsal saddle that extends to near ventral margin of opercle (posterior margin of opercle gray to yellow). Large dark blotches present below and behind eye. Wide stripe present from eye to snout. Dark bands present between orbits and down snout. Amount of melanin on head varies, some individuals with large gray to yellow patches and some almost entirely dark. Iridescent green spot present in some specimens located dorsal to postorbital dark spot.</p> <p> Dorsal fin with dark distal margin, gray band that changes to yellow proximally, then black band made of spots on rays that covers <b>~</b> 1/4 width of fin (interradial membranes gray along band), then narrow gray to yellow band, and finally proximal black band made of roughly triangular spots with longest edges along anterior margins of rays and sloping posteroventrally to posterior margin of rays (interradial membranes gray to yellow); all bands more diffuse anteriorly. Pectoral fin with gray distal margin changing to yellow proximally; dark spots present in two bands distally; distalmost dark band with spots only on rays, but some spots bleed onto membranes in proximal band; dark band at base of pectoral fin may be present; pectoral-fin colors more diffuse ventrally, generally gray with fleshy pads of unbranched and first branched rays almost white. Pelvic fin colored similarly to pectoral with single median band that includes melanophores on interradial membranes and band at base of fin. Anal fin as pelvic fin, but no basal band. Adipose fin yellow to gray proximally and dark distally with dark color confluent with saddle below it. Base color of caudal fin dark with pigment concentrated at junctions of lepidotrichia; two yellow spots present at base (just above and just below midline), single median spot located along midline just after proximal spots, rest of fin with large yellow blotches proximally and large gray blotches distally (gray blotches may fade into base color).</p> <p> <i>Coloration in alcohol.—</i> (Fig. 12) As in life but yellows and grays become tan and iridescence is lost.</p> <p> <i>Distribution.—</i> (Fig. 9) <i>Characidium wangyapoik</i> is only known from the upper Ireng River basin (Amazon River) along the Brazil / Guyana border (known as the Rio Mau in Brazil). Specimens were collected from below Orinduik Falls to the upper falls on the Ireng and its equal tributary, the Sukwabi River, but not above the Uluk Tuwuk or Wotawanda falls of the upper Ireng and Sukwabi Rivers (see Lujan et al., 2020, for a more detailed map and description of this area).</p> <p> <i> <i>Etymology.—</i> Wangyapoik</i> is the Patamona word for the species, and it is used as a noun in apposition. <i>Wang</i> means ‘honey’ and <i>yapoik</i> means ‘seated,’ perhaps in reference to the yellowish color. The Patamona also refer to the species by the English common name of ‘‘fallsfish.’’</p>Published as part of <i>Armbruster, Jonathan W., Lujan, Nathan K. & Bloom, Devin D., 2021, Redescription of the Guiana Shield Darter Species Characidium crandellii and C. declivirostre (Crenuchidae) with Descriptions of Two New Species, pp. 102-122 in Ichthyology & Herpetology 109 (1)</i> on pages 117-120, DOI: 10.1643/i2019299, <a href="http://zenodo.org/record/7846669">http://zenodo.org/record/7846669</a>
The original Lujan syndrome family has a novel missense mutation (p. N1007S) in the MED12 gene
No full textCopyright © 2007 by the BMJ Publishing Group Ltd.A novel missense mutation in the mediator of RNA polymerase II transcription subunit 12 (MED12) gene has been found in the original family with Lujan syndrome and in a second family (K9359) that was initially considered to have Opitz–Kaveggia (FG) syndrome. A different missense mutation in the MED12 gene has been reported previously in the original family with FG syndrome and in five other families with compatible clinical findings. Neither sequence alteration has been found in over 1400 control X chromosomes. Lujan (Lujan–Fryns) syndrome is characterised by tall stature with asthenic habitus, macrocephaly, a tall narrow face, maxillary hypoplasia, a high narrow palate with dental crowding, a small or receding chin, long hands with hyperextensible digits, hypernasal speech, hypotonia, mild-to-moderate mental retardation, behavioural aberrations and dysgenesis of the corpus callosum. Although Lujan syndrome has not been previously considered to be in the differential diagnosis of FG syndrome, there are some overlapping clinical manifestations. Specifically, these are dysgenesis of the corpus callosum, macrocephaly/relative macrocephaly, a tall forehead, hypotonia, mental retardation and behavioural disturbances. Thus, it seems that these two X-linked mental retardation syndromes are allelic, with mutations in the MED12 gene.Charles E Schwartz, Patrick S Tarpey, Herbert A Lubs, Alain Verloes, Melanie M May, Hiba Risheg, Michael J Friez, P Andrew Futreal, Sarah Edkins, Jon Teague, Sylvain Briault, Cindy Skinner, Astrid Bauer-Carlin, Richard J Simensen, Sumy M Joseph, Julie R Jones, Josef Gecz, Michael R Stratton, F Lucy Raymond, Roger E Stevenso
Limatulichthys nasarcus Londoño-Burbano, Lefebvre & Lujan, 2014, new species
No full text<i>Limatulichthys nasarcus</i>, new species <p>(Fig. 2, Tables 1 and 2)</p> <p> <b>Holotype.</b> MCNG 56560 (ex. AUM 39845), 150.9 mm SL, Venezuela, Orinoco River drainage, Ventuari River, beach below Raudales Tencua, 56 km ESE of San Juan de Manapiare, N 05°02'59'', W 65°40'20'', N.K. Lujan, O. Leon, R. Pajua, 19–20 April 2004.</p> <p> <b>Paratypes.</b> Seven specimens, all from Venezuela, Amazonas State, Ventuari River drainage: AUM 39845, 1 alc., 122.5 mm SL, 1 cs, 130.7 mm SL, same data as holotype. AUM 39280, 1 alc., 112.2 mm SL, Parucito River at Raudales Salomon, 2.7 km NE of San Juan de Manapiare, N 05°20'46'', W 66°02'00'', N.K. Lujan, D.C. Werneke, O. León, 16 April 2004; ANSP 182816, 1 alc., 129.0 mm SL, Ventuari River, rapids below Salto Tencua, 227 km ESE of Puerto Ayacucho, 114 masl, N 05°03'03'', W 65°37'28'', N.K. Lujan, D.C. Werneke, M.H. Sabaj, T. Carvalho, 0 6 April 2010; MBUCV-V-35730, 1 alc., 137.6 mm SL, same data as AUM 39845. ROM 88302, 1 alc., 122.1 mm SL, same data as ANSP 182816. ANSP 191324, 1 alc., 134.9 mm SL, Ventuari River, downstream end of extensive rocky rapids ca. 1 km below Salto Tencua, 227 km ESE of Puerto Ayacucho, N 05°03'03'', W 65°37'28'', M. Sabaj Pérez, N.K. Lujan, D.C. Werneke, T. Carvalho, S.V. Meza, O. Santaella, 16 April 2010.</p> <p> Holotype <i>L</i>. <i>nasarcus</i> L. <i>griseus</i></p> <p> Percentages in SL 150.9 Min Max Mean Min Max Mean Head length 36.4 21.4 24.2 23.4 17.7 21.0 19.2 Predorsal length 47.9 30.9 33.4 31.7 30.0 34.4 32.0 Posdorsal length 87.3 56.8 62.4 58.1 58.0 63.6 60.6 Posanal length 74.1 48.1 50.9 50.0 49.4 52.8 51.7 Abdominal length 24.1 16.0 18.0 16.8 14.5 18.0 17.0 Thoracic length 20.7 12.9 14.2 14.1 12.5 14.5 13.4 Dorsal fin length 29.8 19.7 21.4 21.2 17.2 22.8 19.8 Pectoral fin length 24.0 15.9 17.5 16.4 14.0 16.8 15.7 Pelvic fin length 21.1 14.0 15.9 14.7 12.0 15.1 13.9 Anal fin length 24.0 15.7 18.0 16.2 13.7 15.6 14.6 Head depth at supraoccipital tip 12.0 6.4 8.0 6.8 5.9 7.8 7.2 Body depth at dorsal fin origin 12.9 7.4 8.8 8.4 7.7 9.1 8.4 Caudal peduncle depth 2.6 1.2 1.9 1.5 1.2 1.7 1.5 Cleithral width 22.8 12.6 16.4 14.7 11.4 13.8 12.2 Distance between origin of pelvic fin and urogenital pore 10.8 6.0 7.4 6.6 6.0 7.1 6.8 Distance between origin of anal fin and urogenital pore 17.0 10.8 12.0 11.3 10.9 12.3 11.5 Body width at dorsal fin origin 21.1 12.8 15.3 14.0 11.9 15.3 12.9 Body width at pectoral fins origin 25.4 16.6 17.6 16.8 13.6 18.3 16.0 Body width at pelvic fins origin 21.8 13.3 15.2 14.3 11.7 15.6 13.0 Body width at anal fin origin 18.9 10.9 13.4 12.5 10.2 13.0 11.6 Body width at caudal fin origin 4.5 2.4 3.0 2.8 2.0 3.2 2.3 <b>Non-types:</b> Seven specimens, all from Venezuela, Bolivar State, Caura River drainage: ANSP 135884, 2 alc., 104.5 and 119.5 mm SL, sandbar along Caura River some 400 m upstream from Cano Barranca-Rio Caura junction, N 07°08'00'', W 65°04'00'', J.E. Bohlke and W.G. Saul, 30 January 1977. ANSP 135900, 1 alc., 80.5 mm SL, sandbar along Caura River at junction of Caño Chuapo and Caura River, N 07°07', W 65°00', J.E. Bohlke and W.G. Saul, 29 January 1977. ANSP 135755, 1 alc., 60.0 mm SL, Urbana (Urbani) River on Maripa-Las Trincheras road, N 07°18', W 65°00', J. E. Bohlke, W.G. Saul, and E. Ferrer-Veliz, 20 January 1977. ANSP 135883, 3 alc., 22.2–92.9 mm SL, sandbar 0.80 km upstream from Jabillal on Caura River, N 06°56', W 64°50', J.E. Bohlke, W.G. Saul, E. Ferrer-Veliz, and local boys, 27 January 1977.</p> <p> <b>Diagnosis.</b> <i>Limatulichthys nasarcus</i> can be diagnosed from <i>L</i>. <i>griseus</i> by having: anterior abdominal plates half the size of those at center of abdomen (vs. plates similar in size); spots across the entire dorsum, including snout and head, less than half of diameter of naris (vs. indistinct spots larger or equal than diameter of naris); dark well-defined spots on lateral portions of head and opercle, larger than those on dorsum (vs. spots on lateral portions of head and opercle equal in size to those on remainder of body); profile of snout in dorsal view broadly rounded (vs. acutely triangular); head longer (21.4–24.2 SL vs. 17.7–21.0%); and longer anal fin (15.7–18.0 SL vs. 13.7–15.6%).</p> <p> <b>Description.</b> Head and body strongly depressed. Dorsal profile sloped upward from snout to supraoccipital tip, slightly concave or straight from supraoccipital to caudal peduncle. Ventral profile straight. Snout broad, rounded in dorsal view (see Diagnosis; Fig. 2), with rounded anterior margin and convex sides; snout covered with plates. Orbits oriented dorsally, internares space narrower than interorbital space. Orbital notch poorly developed, dorsal margin of orbit not raised.</p> <p>Upper lip with fringe of usually five triangulate papillae increasing in size laterally, papillae not extending past premaxillary teeth. Row of triangulate papillae extending along margins of lower lip to base of maxillary barbel. Maxillary barbel short, thin, and attached to lower lip via fleshy membrane. Lower lip divided by median furrow with lateral lobes expanded posteriorly to create an emarginated posterior profile. Ventral surface of lower lip having scarce hemispherical papillae. Teeth bilobed, slender. All teeth having medial cuspid larger than lateral. Premaxillary teeth 5–8 per ramus (mode = 7), dentary 6–10 per ramus (mode = 8).</p> <p>Abdomen covered with contiguous plates from cleithrum to insertion of pelvic fins, plates not organized into distinct patterns. Ventral surface between cleithrum and oral disk having few poorly developed plates in both small and large specimens, with a small region totally lacking plates around the lower lip. Plates missing around pectoralfin insertion. Anterior abdominal plates smaller than central abdominal plates (see Diagnosis; Fig. 3) Three preanal plates surrounding urogenital pore. Predorsal region in both juvenile and adult specimens lacking well-developed keels. Two predorsal plates.</p> <p>Pectoral fin I,6; first branched ray extending posteriorly slightly beyond pelvic-fin origin, first branched ray longer than spine and all other branched rays; posterior margin concave. Pelvic fin I,5; spine shorter or equal in length to branched rays; posterior margin either straight or oblique. Anal fin I,5; origin posterior to vertical through posteriormost dorsal-fin insertion; first three branched rays longer than others; posterior margin convex. Dorsal fin I,7; spine and first branched ray longer than others; spine extended as filament almost twice as long as branched rays; posterior margin obliquely convex. Caudal fin i,10,i; upper caudal ray extended as a filament almost twice as long as branched rays; posterior margin concave.</p> <p> <b>Color in alcohol.</b> Dorsal base color sandy brown; small, distinct, unorganized black spots distributed across entire dorsum. Three or four conspicuous black spots on lateral margins of the head below the eye, spots larger than those on dorsum (Fig. 4). Five indistinct transversal bands that are similar in color to spots: anteriormost margin of first band at dorsal-fin origin, anteriormost margin of second band at posteriormost tip of dorsal-fin rays when adpressed, anteriormost margin of third band six plates posterior from posteriormost insertion of dorsal fin, anteriormost margin of fourth band four plates posterior to the third band, and anteriormost margin of fifth band two plates anterior to caudal-fin origin. All fins except anal fin with black dots. Pectoral fins with spots both on membrane and rays, while on other fins spots only present on rays. Anal fin hyaline. Caudal fin with a noticeable horizontal black band across posterior half of the lower branched rays (Fig. 2). Ventrum uniformly pale yellow. Sexual dimorphism: None observed.</p> <p> <b>Distribution.</b> Known from the middle Ventuari and lower Caura rivers, Orinoco River drainage, Venezuela (Fig. 5).</p> <p> <b>Etymology.</b> The specific epithet <i>nasarcus</i> is a combination of the Latin <i>nasus</i> meaning snout, and <i>arcus</i> meaning bow-shaped, in reference to the rounded snout of the species when compared to its congener <i>Limatulichthys griseus</i>.</p> <p> <b>Remarks.</b> As part of our comparative analysis, we examined two <i>Limatulichthys</i> cf. <i>griseus</i> specimens from the Beni River, Amazon Basin, Bolivia (AUM 28353) that were morphologically similar to <i>L</i>. <i>nasarcus</i>. According to the PCA analysis (Fig. 6), though, <i>Limatulichthys</i> cf. <i>griseus</i> ‘Beni’ can still be separated from <i>L</i>. <i>nasarcus</i> by presenting a narrower head and longer snout—characters that are shared with <i>L</i>. <i>griseus</i>. We therefore tentatively identify these specimens as <i>L.</i> cf. <i>griseus</i> ‘Beni’ due to the limited number of specimens available and the tremendous geographic distance between the populations analyzed here.</p>Published as part of <i>Londoño-Burbano, Alejandro, Lefebvre, Stéphanie L. & Lujan, Nathan K., 2014, A new species of Limatulichthys Isbrücker & Nijssen (Loricariidae, Loricariinae) from the western Guiana Shield, pp. 360-370 in Zootaxa 3884 (4)</i> on pages 362-368, DOI: 10.11646/zootaxa.3884.4.5, <a href="http://zenodo.org/record/230160">http://zenodo.org/record/230160</a>
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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